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The peterson works well on 2" eyepieces larger then 35mm anything less and it does nothing.
Its very good for astrophotographgy as it does open up the undersized visual back but there is other ways to do this now such as focusers that screw onto the 3 1/2" rear thread instead of the 1 3/4" currently used.
I cant see any 2" filter affecting you at all.
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